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In 1933, General Drafting Company was the first company to produce four-color road maps. Thus a map of Baltimore which has the following numbers on it: N132 CR654 was published in June of 1954. Cram Company In or near the border at one corner of each map [atlases are coded differently] is a coded reference to the date of revision.

In May, 1952, the company moved from New York City to Convent Station, N. Substitute numbers for the following letters to get the month and year: A - 0 B - 9 C - 8 D - 7 E - 6 F - 5 G - 4 H - 3 I - 2 J - 1 At the bottom left corner of each map (usually) are some letters.

The following list gives the two-letter date code, the year it indicates, and an OCLC number for a record input by the Library of Congress.

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One final note: Diversified's use of its code was spotty, at best. Therefore, the presence of this code on a Diversified map will allow you to date the map.

However, the absense of the code does not mean the map was necessarily issued in one of the years before Diversified began using its code.

However, it did not start using this code until 1964.

(I have not been able to find date codes on maps issued by Diversified in 1962 or 63).

Hope this info, confusing as it is, is helpful to you.

Founded December 1, 1909 as: Engineering and General Draughting Company. These letters are then followed by a number that denotes the month and year that the map was published.This allows for construction of a list of proper dates.For earlier decades, Gousha indicated the year by a single letter (A-Z), then by double-letters (AA-ZZ, the last being from 1978).Clason Map Company was a map publisher in Denver, Colorado that published the first road atlas of the U. Use the link above to connect to a site at Michigan State University to learn more about dating Clason maps.The following information was provided by Jim Wakefield: Some, but not all, Diversified maps contianed a three or four digit date code.Finally, the last digit of the code is the last digit of the year of issue.

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